<?php

/**
 * Filter for new content
 */
class views_handler_filter_history_user_timestamp extends views_handler_filter {

    // Don't display empty space where the operator would be.
    var $no_operator = TRUE;

    function expose_form_right(&$form, &$form_state) {
        // We don't want any of the usual options for exposed filters.
    }

    function value_form(&$form, &$form_state) {
        // Only present a checkbox for the exposed filter itself. There's no way
        // to tell the difference between not checked and the default value, so
        // specifying the default value via the views UI is meaningless.
        if (!empty($form_state['exposed'])) {
            if (isset($this->options['expose']['label'])) {
                $label = $this->options['expose']['label'];
            } else {
                $label = t('Has new content');
            }
            $form['value'] = array(
                '#type' => 'checkbox',
                '#title' => $label,
                '#default_value' => $this->value,
            );
        }
    }

    function query() {
        global $user;
        // This can only work if we're logged in.
        if (!$user || !$user->uid) {
            return;
        }

        // Don't filter if we're exposed and the checkbox isn't selected.
        if ((!empty($this->options['exposed'])) && empty($this->value)) {
            return;
        }

        // Hey, Drupal kills old history, so nodes that haven't been updated
        // since NODE_NEW_LIMIT are bzzzzzzzt outta here!

        $limit = time() - NODE_NEW_LIMIT;

        $this->ensure_my_table();
        $field = "$this->table_alias.$this->real_field";
        $node = $this->query->ensure_table('node', $this->relationship);

        if (module_exists('comment')) {
            $ncs = $this->query->ensure_table('node_comment_statistics', $this->relationship);
            $clause = ("OR $ncs.last_comment_timestamp > (***CURRENT_TIME*** - $limit)");
            $clause2 = "OR $field < $ncs.last_comment_timestamp";
        }

        // NULL means a history record doesn't exist. That's clearly new content.
        // Unless it's very very old content. Everything in the query is already
        // type safe cause none of it is coming from outside here.
        $this->query->add_where($this->options['group'], "($field IS NULL AND ($node.changed > (***CURRENT_TIME*** - $limit) $clause)) OR $field < $node.changed $clause2");
    }

    function admin_summary() {
        if (!empty($this->options['exposed'])) {
            return t('exposed');
        }
    }

}

